Processes for drying sewage sludge and filtering water

Details Processes for drying sewage sludge and filtering water Processes for drying sewage sludge and filtering water

1978-05-25

1980-03-18

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 60, 71 72, 210 10, 44 10R, F26B 700

Patent

active

041932064

ABSTRACT:
A process for drying and granulating sewage sludge. Wet sewage sludge is dried in either a thermal drying zone or a mechanical dewatering zone comprising a cylindrical chamber having a porous wall and a centrally mounted rotating helical screw conveyor which does not contact the porous wall. A plasticizer is added to the dried sludge and the resultant mixture is extruded to form fertilizer granules. Also disclosed is a process for filtering suspended solids from a water stream using the apparatus of the mechanical dewatering zone.

REFERENCES:
patent: 1151186 (1915-08-01), Johnson
patent: 1772262 (1930-08-01), Navgle
patent: 3531871 (1970-10-01), Watson et al.
patent: 3938434 (1970-02-01), Cox
patent: 4041854 (1977-08-01), Cox
patent: 4098006 (1978-07-01), Maffet
patent: 4099336 (1978-07-01), Maffet
patent: 4121346 (1978-10-01), Maffet
patent: 4128946 (1978-12-01), Maffet
patent: 4130945 (1978-12-01), Brachthauser

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